Stand supported vessel and mixer

ABSTRACT

This disclosure is directed to a stand supported vessel and mixer constructed to permit the vessel and mixer to be pivoted between operative and inoperative positions in accordance with a predetermined synchronized motion wherein the mixer is first partially lifted out of the vessel a predetermined amount without effecting rotation of the vessel whereupon further pivoting of the mixer results in synchronous movement of the vessel toward a tilting or pouring position. A positive locking means is operatively associated between the mixer and vessel for securing the vessel against rotation until after the mixer has been partially rotated a predetermined amount.

United States Patent n91 Margittai I541 STAND SUPPORTED VESSEL AND MIXER[76] Inventor: Thomas Margittai, 778 Cornwall Drive, State College, Pa.16801 [22] Filed: Aug. 5, 1971 [21] Appl. No.: 169,344

[56] References Cited UNITED STATES PATENTS 2,251,903 8/1941 Anstice.259/lO8 2,557,622 6/1951 Trier ....259/108 3,224,743 12/1965 Freedman..259/85 3,421,741 1/1969 Baechler ..259/108 1 Feb. 20, 1973 3,334,8718/1967 Stone .259/1 71 Primary ExaminerRobert \V. Jenkins Att0rneyPhilipG. Hilbert [57] ABSTRACT This disclosure is directed to a standsupported vessel and mixer constructed to permit the vessel and mixer tobe pivoted between operative and inoperative positions in accordancewith a predetermined synchronized motion wherein the mixer is firstpartially lifted out of the vessel a predetermined amount withouteffecting rotation of the vessel whereupon further pivoting of the mixerresults in synchronous movement of the vessel toward a tilting orpouring position. A positive locking means is operatively associatedbetween the mixer and vessel for securing the vessel against rotationuntil after the mixer has been partially rotated a predetermined amount.

12 Claims, 6 Drawing Figures PATENTED FEBZO ms SHEET 2 OF 2 STANDSUPPORTED VESSEL AND MIXER PROBLEM AND PRIOR ART In the mixing art, andparticularly in the commercial cooking arts, the mixing or cookingvessel is generally supported on a stand to pivot between an operative,upright, position and a tilted, pouring or emptying position. Generallythe vessel is supported on a stand by opposed trunnions about which thevessel pivots. The mixer is supported on a stand above the vessel toextend into the vessel to effect the necessary mixing action.l-leretofore to effect the emptying of such vessels it was necessary tofirst lift the mixer free of the vessel so that the vessel would then berendered free to pivot or tilt to an emptying position. The problem isparticularly aggravated when such mixers are used with the usual deepvessels as for example trunnion kettles. This is because such kettlesrequire the associated mixer to be vertically lifted a considerabledistance in order to clear the mixer of the vessel before the vesselcould be tilted to an emptying position. In such combination it washeretofore necessary to utilize various independent lifting mechanismsand systems to lift such mixers free of the vessel.

Independent operating mechanisms have been often used to first effect alift or remove the mixer, and thereafter rotate the vessel. Suchindependent means required independent operating means, as for example,complex systems of levers and/or linkages, all of which greatly added tothe cost of manufacture, use and maintenance of such vessel mixerstands.

OBJECTS It is therefore an object of this invention to provide a standsupported vessel and associated mixer in which the mixer can be readilypivoted relative to the vessel a predetermined amount in a directiontoward lifting the mixer out of the vessel before the rotation ortilting of the vessel is permitted to occur.

Another object of this invention is to provide in a stand supportedvessel and mixer therefor, timed or synchronized movement between themovement of the mixer and the rotation of the vessel between a normaloperative position and inoperative position, whereby the lifting of themixer and rotation of the vessel can occur in a combined movement.

Another movement is to provide a stand supported vessel and mixerwherein the lifting of the mixer and the tilting of the vessel isattained by a continuous synchronized mechanical movement.

Another object of the invention is to provide a relatively simple andinexpensive stand supported vessel and mixer which is simple and easy tooperate.

Another object is to provide a stand supported vessel and mixerconstructed so as to prohibit any jamming or knocking between the vesseland the mixer as one or the other is moved between an operative and aninoperative position.

Another object is to provide a stand supported vessel and mixer whichcan be readily cleaned and sanitized.

Another object of this invention is to provide a stand supported vesseland associated mixer in which the vessel is positively secured againstrotation until such time that the mixer has been partially lifted orrotated a predetermined amount between an operative mixing position andan inoperative pouring position.

BRIEF SUMMARY OF THE INVENTION The foregoing objects and other featuresand advantages of this invention are attained by a stand having a lowerpedestal portion and an upper portion pivotally connected so that theupper portion may be rotated relative to the lower portion. A vessel ispivotally mounted on the lower pedestal portion of the stand by opposedtrunnions rotatably journalled in suitable bearings. A mixing means issupported on the upper stand portion to rotate therewith, and itincludes a mixing head arranged to extend into the vessel supported onthe lower pedestal portion of the stand. An operating means isoperatively associated between the mixer and the vessel whereby rotationof the vessel is permitted only after the mixing head has been firstpivoted a predetermined amount toward inoperative position. Thereaftercontinued pivoting of the mixer effects complemental or synchronizedpivoting of the vessel from a normal, upright, operating position to atilted emptying position. This is attained by a gear sector operativelyassociated with one of the vessel trunnions and an arm pivotallyconnected to the upper stand and having a rack sector connected to anend portion thereof adapted to engage with the gear sector, when theupper stand has been pivoted relative to the lower stand a predeterminedamount. Subsequent to the meshing of the rack with the gear sectorcontinued rotation of the upper stand portion relative to the lowerstand effects a synchronous movement between the mixer and the kettle toa tilted position.

To prohibit rotation of the vessel before the rack sector engages inmeshing relationship with the gear sector of the vessel trunnion, alocking means is provided. The locking means comprises a latching leverwhich is pivotally mounted to the stand adjacent the trunnion. One endof the latching lever is provided with a latch head which is adapted toengage with a complementary catch formed in the end of the trunnion. Theother end of the latching lever is disposed in camming relationship withthe rack arm. The arrangement is such that the rack arm will normallycam the latching member into latching engagement with the trunnion catchwhenever the rack portion of the arm is out of engagement with the gearsector, and will effect unlatching of the latching lever when the rackportion meshes with the gear sector.

FEATURES A feature of this invention resides in the provision of a standsupported kettle and associated mixer wherein the movement of the mixeris synchronized to the movement of the vessel so that the movement ofthe mixer out of the vessel and the pivoting of the vessel from anoperative to inoperative position occurs in a continuous synchronousmovement.

Another feature of this invention resides in the provision of anautomatically actuated latching member for positively securing thevessel from rotating until such time that the mixer has been moved apredetermined amount relative to the vessel.

Another feature of this invention resides in the provision wherein thepositive locking means is rendered responsive to the movement of therack arm.

Another feature of this invention resides in the provision wherein thesynchronous action between the pivoting of the mixer and the vessel maybe reversed during any position between the operative and inoperativelimits of movement.

Another feature of this invention resides in the provision of a positiveacting mechanical movement to effect a predetermined continuoussynchronous movement between the pivoting of the mixer and the pivotingof the associated vessel between operative and inoperative position.

Another feature of this invention resides in the provision that thestand supported vessel and associated mixer therefor is relativelysimple in construction, can be easily fabricated and which is positivein operation.

Other features and advantages become more readily apparent whenconsidered in view of the drawings and specification in which:

FIG. 1 is a front elevation view illustrating the stand supported vesseland mixer therefor in a normal operative mixing position.

FIG. 2 is a side sectional view of the stand supported vessel and mixertaken along line 2--2 on FIG. 1 wherein the component parts thereof areillustrated in an inoperative, or tilted pouring position.

FIG. 3 is a side sectional view similar to FIG. 2 but showing the vesseland mixer in an inoperative pouring position.

FIG. 4 is a detail view of the locking mechanism in an intermediateunlocking position as the rack sector engages in meshing engagement withthe gear sector of the trunnion pivot.

FIG. 5 illustrates the component parts of the locking means in the fullytilted position of the vessel.

FIG. 6 is an end view of FIG. 5.

Referring to the drawings there is shown in FIGS. 1 to 3, a standsupported vessel and mixer 10 embodying the present invention. The stand10 comprises a lower pedestal portion 11 defined by a pair of lower basemembers 12, 13 to which there is connected an upright stanchion 12A,13A. The respective base members 12, 13 are interconnected by a lowercross member 14. As noted in FIGS. 1 and 2 the respective base members12 and 13 are suitably supported on short legs 15 which are screwthreaded into appropriate sockets formed adjacent the opposed ends ofthe base members 12 and 13. By effecting rotation of the legs 15 in onedirection or the other it will be understood that the stand may besuitably leveled on a supporting surface.

An upper stand portion 16 is pivotally connected to the lower standportion 11. As shown, the upper portion 16 of the stand comprises aninverted U-shaped member which is pivotally connected to the lower standportion about pivot bar 17 journalled in extended bearing lugs 18. Thebearing lugs 18 are connected to the respective uprights 12A, 13A of thelower stand portion and extend to the rear thereof.

Rotatably journalled on the lower stand portion 11 is a vessel 19 whichin the illustrated form of the embodiment comprises a kettle having ahemispherical bottom and commonly known as a trunnion kettle. The kettle19 is rotatably journalled to the upright members 12A, 13A of the lowerstand portion 11 by means of oppositely disposed trunnions 20 and 21which are rotatably supported in suitable bearings 22 connected to therespective uprights 12A, 13A. The arrangement of the kettle 19 is suchthat it may rotate about a horizontal axis between a vertical uprightposition as seen in FIG. 3, to a tilted or pouring position.

Mounted on the cross arm portion 23 of the upper stand portion 16 bymeans of a suitable bracket 24 is a mixing device 25. As shown, themixing device 25 comprises of a power means in the form of an electricmotor 25A mounted on the bracket 24, the armature of which is connectedto a shaft 26 on which a mixing blade head 27 is attached. It will benoted that the mixer 25 is connected to the cross arm 23 of the upperstand member 16 so as to enable the mixer 25 to pivot whenever the upperstand portion 16 is pivoted relative to the lower pedestal stand portion11 about pivot 17. To prevent the mixing head 27 from hitting the wallsof the vessel 19 whenever the upper stand portion 16 is pivoted, a meansis provided for effecting timed or synchronized rotation of the vesselabout its trunnion 20 and 21 as the mixer and upper stand 11 is pivoted.The arrangement is such that the mixer 25 and kettle 19 rotate toinoperative position as indicated in FIG. 3 without causing the mixer tomake contact with the walls of the vessel.

This is attained by providing a synchronizing means 28 which isconstructed and arranged to effect timed rotation between the vessel 19and the mixer 25. As best seen in FIGS. 1 to 3, the synchronizationmeans 28 comprises a gear or gear sector 29 which is connected totrunnion 21 of the kettle 19. Cooperatively associated with the gear orgear sector 29 is an arm 30 which is pivoted at one end to a bracket 31depending from the cross arm 23 of the upper stand portion 16. The otherend of the arm 30 is extended in the vicinity of the gear sector 29 andhas formed on the end thereof a rack sector 32 which is arranged to bedisposed in alignment with the gear sector 29 on trunnion 21. A guide 33is operatively associated with trunnion 21 to receive and maintain thefree end of arm 30 adjacent the gear 29 to permit engagement of the rack32 with the gear, as will be described.

In operation the arrangement is such that whenever the upper standportion 16 is rotated about its pivot 17 relative to the lower standportion 11, the arm 30 is raised as seen in FIG. 3, causing the racksector 32 to be moved into meshing engagement with the gear sector 29 ofthe trunnion 21. The arrangement is such that the rack sector 32 of arm30 will effect engagement with the gear sector 29 only after the upperstand portion 16 and associated mixer 25 has been rotated apredetermined amount. The initial pivoting of the upper stand portion 16and mixer 25 partially lifts the mixing head from the vessel. However,because such vessels are quite deep, the mixer head can not completelyclear the vessel by rotation of the upper stand above. Accordingly, inorder to clear the end 27 of the mixer from the vessel 19, the vessel isalso required to be tilted or rotated toward a tilted or pouringposition so that upon continued rotation of the upper stand and mixer,the end 27 of the mixer moves completely free of the vessel 19. In thisinvention rotation of the vessel is effected by the engagement of racksector 32 with gear 29. Thus upon continued rotation of the upper standportion, the engagement of the rack 32 with the gear sector 29 of thetrunnion causes the kettle to be driven by arm 30 as the mixer isfurther pivoted to a horizontal position as indicated in FIG. 3.

The stroke of the rack 32 is sufficiently long so as to effect rotationof the kettle from the upright position of FIG. 2 to a rotated or tiltedposition of FIG. 3.

In order to prevent rotation of the kettle 19 until such time that therack sector 32 is moved into engagement with the trunnion gear section29, a locking means 34 is provided. As best seen in FIGS. 1, 4 and 5,the positive locking means 34 comprises latch levers 35, 35A which arepivotally mounted about pivot 36 on the upright 12A of the lower standportion 11. As shown, one end of the latching lever 35 is provided witha cross head latch 37 which in the normal upright position of the kettle19 is adapted to engage or be received in a slot 38 formed in the end ofthe kettle trunnion 21. Accordingly, as seen in FIG. 1 the latching head37 is normally maintained in latching position within the horizontallydisposed catch or slot 38 of the trunnion to prevent any unintentionalrotation of the kettle when the kettle 19 is in the upright position.

Positive maintenance of the latching member 35 in the locking positionof FIG. 1 is attained by the camming action of the rack arm 30 oncomplementary lever 35A. A biasing means 39 in the form of a coil springis connected between the lever 35A and the upright member 12A of thestand. The spring tension exerted by the spring 39 on the latching lever35 is such that the latching lever 35 is normally urged towardunlatching position.

It will be noted that lever 35A has fixedly secured thereto a bar 42.Interconnected between bar 42 and lever 35 is a spring 43 whichfunctions to bias lever 35 and cross head latch 37 in latchingrelationship to slot 38 when the kettle is in the upright position as inFIG. 1.

Fixedly connected to lever 35 is a stop bar 41 which is adapted to beengaged by bar 42 of lever 35A when the end of lever 35A rides off theside of rack arm 30 as seen in FIG. 4. Thus when the rack arm advancesthe rack 32 to meshing relationship with gear sector 29, the tension ofspring 39 causes lever 35A to rotate clockwise about pivot 36. In doingso the bar 42 connected to lever 35A makes contact with stop bar 41 oflever 35, causing lever 35 to be displaced toward unlatching position asseen in FIGS. 4 and 5. Upon contact of bar 42 with stop bar 41, thelatching levers 35 and 35A will operate as an integral unit.

Upon return of the rack arm, the end of arm 30 engages lever 35A to camit in a counterclockwise direction about pivot 36. In doing so thecamming action between lever 35A and rack arm 30 overcomes the bias ofspring 39. Because of the interconnection between lever 35 and bar 42 byspring 43, the crosshead latch 37 of latch 35 is urged into latchingengagement with slot 38 when the kettle assumes the upright position ofFIG. 1. With the latch assembly 34 described the relative movement oflevers 35 and 35A as described, prohibits any binding which may occurwhich could adversely affect or break the mechanism.

With the mixer 25 and kettle 19 in normal operative position as seen inFIGS. 1 and 2, the side of the rack arm 30 effects a camming action onthe end of the lever 35A to overcome the normal bias exerted by spring39, which in turn causes bar 42 to tension spring 43 to maintain thelatch 35 in locking engagement with the slot 38. Thus as the upper standportion 16 is rotated in a counterclockwise direction, as seen in FIG.3, to effect removal of the mixer from the kettle the rack arm 30 willslide along the end of lever 35A of the latching assembly 34. When therack arm 30 has passed the end of lever 35A bar 42 engages stop bar 41,with spring 39 causing the end of latch 35A to override the end of therack arm 30, as seen in FIG. 4; thereby causing the latching end 37 tobecome disengaged from the slot 38. With the latching lever 35 thusdisengaged, the kettle is free to rotate upon continued movement of therack segment 32 across the gear 29. Thus the arrangement is such thatduring initial rotation of the mixer 25 the kettle is positively lockedor latched against rotation. As the rack of arm 30 engages the gear 29,the kettle trunnion is automatically unlatched to permit continuedrotation of the upper stand to effect rotation of the kettle 19. Thusany rotation of the kettle 19 is positively prohibited, until such timeas the rack segment 32 of the arm 30 is advanced to meshing relationshipwith the gear sector 29 of the trunnion. In this manner entire actuationof the mixer 25 and kettle 19 is synchronized so that their respectiverotation can be effected in a twostep operation which is attained by onecontinuous mechanical movement; namely by effecting the rotation of theupper stand portion and associated mixer about the axis of rotationthrough an angle of rotation of approximately To facilitate rotation ofthe upper stand portion and the associated mixer, a suitable handle 40is operatively connected to the upper stand portion by which an operatormay effect such rotation. However, it will be readily understood that inlieu of a manually operated handle 40, that a suitable power means, e.g.an electric motor, or fluid activated piston and cylinder assembly orthe like (not shown) may be operatively associated with the upper standportion 16 to effect the rotation thereof. However, such power means arepractical on kettle stands of substantial proportion which would berendered impractical for manual operation. However, the particularsynchronizing means 23 and associated locking means 34 would be equallyoperable for either the manual or power operated stand.

With the construction described it will be readily apparent that themixer 25 can be readily removed from the kettle 19 in a relativelysimple, efficient and positive manner in which linkages and/orconnections heretofore required are greatly simplified. Also thearrangement is such that the action of the mixer 25 and kettle 19 can bereversed at any point of operation between the normal operative positionand the tilted inoperative position. The co-action between the rack arm30 and the associated gear sector 29 is such that the mixer is requiredto be first rotated a predetermined amount prior to the rotation of thevessel; and that both the mixer and vessel rotate about parallel axis.Also a positive automatic locking means is provided which positivelyprohibits rotation of the vessel until engagement occurs between therack arm 30 and the gear 29.

While the present invention is described with respect to a particularembodiment thereof it will be readily appreciated and understood thatvariations and modifications may be made without departing from thespirit or scope of the invention.

What is claimed is:

1. In combination:

a stand,

a vessel,

pivot means for rotatably supporting said vessel on said stand betweenan operative mixing position and a tilted emptying position,

a mixer means mounted on said stand,

said mixer means having a mixing head normally disposed to extend intosaid vessel in the operative position thereof,

means for pivoting said mixer means on said stand to lift said mixinghead out from said vessel, and synchronizing means operativelyassociated with said mixer pivoting means to effect rotation of saidvessel after said mixing head is first pivoted a predetermined amountwhereupon pivoting of said vessel to tilted emptying position iseffected as said mixer is further pivoted free of said tilting vessel.

2. The invention as defined in claim 1 wherein the pivot means of saidvessel and said mixer rotate about parallel axes.

3. The invention as defined in claim 1 wherein said stand includes alower pedestal portion and an upper stand portion pivotally connected tothe lower pedestal portion,

said mixer means being mounted on said upper stand portion, and

said vessel being rotatably journalled on said lower pedestal portion.

4. The invention as defined in claim 1 and including positive lockingmeans for securing said vessel against rotation until said mixing headis first pivoted said predetermined amount.

5. The invention as defined in claim 4 wherein said locking meansincludes a latch pivotally mounted on said stand adjacent said vesselpivot means normally operative to lock said pivot means from rotation,

said latch being operatively associated with said synchronizing means toeffect disengagement of said latch after said mixing head has beenpivoted said predetermined amount.

6. The invention as defined in claim 1 wherein said vessel pivotingmeans includes:

a gear sector, and

said synchronizing means includes an arm pivotally connected to saidmixer pivoting means,

said arm having a rack adjacent the extended end thereof,

said rack portion extending only along a portion of said arm wherebysaid rack is disposed to mesh with said gear sector only after saidmixer has pivoted said predetermined amount.

7. The invention as defined in claim 6 and including a positive lockingmeans operatively associated with said vessel pivoting means and saidarm for securing said vessel against rotation until said rack isdisposed in meshing relationship with said gear sector.

8. The invention as defined in claim 7 wherein said locking meansincludes a latching lever pivotally mounted on said stand adjacent saidvessel pivot means,

a catch formed on said vessel pivot means to normally receive saidlatch,

spring means operating on said latch for normally biasing said latchtoward unlatching position, and

said arm normally operating on said latch to resist the bias of saidspring means tending to urge said latching means toward locked positionwhen said rack is out of meshing relationship with said gear sector.

9. The invention as defined in claim 8 wherein said catch comprises aslot formed in said vessel pivoting means.

10. In combination:

a stand having a lowerportion and an upper portion,

means for pivotally connecting said upper portion to said lower portion,

a vessel,

pivot means for supporting said vessel on said lower portion of saidstand for rotation about an axis of rotation disposed parallel to theaxis of rotation of said upper stand portion relative to said lowerstand portion,

a mixing means connected to the upper stand portion to rotate therewith,

said mixing means having a mixing head arranged to normally extend intosaid vessel,

a gear sector operatively associated with the pivot means of saidvessel, 7

an arm pivotally connected to said upper stand portion,

said arm having a rack sector connected to an end portion thereofwhereby said rack sector engages with said gear when said upper standportion is pivoted relative to said lower stand portion a predeterminedamount so that upon further pivoting of said upper stand portionrelative to said lower stand portion said rack sector engages said gearto effect pivoting of said vessel about its axis of rotation, and handlemeans for effecting the pivoting of said upper stand portion.

11. The invention as defined in claim 10 and including a positivelocking means operatively associated between said arm and said vesselpivoting means for securing said vessel from rotating until said racksector is disposed into meshing relationship with said gear sector.

12. The invention as defined in claim 11 wherein said locking meanscomprises:

a lever,

means for pivoting said lever intermediate the ends thereof to saidstand adjacent said vessel pivot means,

a latch connected to one end of said locking lever,

and

said other end of said locking lever adapted to be disposed inengagement with said arm,

a complementary slot formed in said vessel pivot means for receivingsaid latch in the locked position,

a spring means operating on said locking lever for normally biasing saidlatch toward unlocking position, and

said am operating on said other end of said locking lever resisting thebias of said spring means when said rack is out of meshing engagementwith said gear sector.

1. In combination: a stand, a vessel, pivot means for rotatablysupporting said vessel on said stand between an operative mixingposition and a tilted emptying position, a mixer means mounted on saidstand, said mixer means having a mixing head normally disposed to extendinto said vessel in the operative position thereof, means for pivotingsaid mixer means on said stand to lift said mixing head out from saidvessel, and synchronizing means operatively associated with said mixerpivoting means to effect rotation of said vessel after said mixing headis first pivoted a predetermined amount whereupon pivoting of saidvessel to tilted emptying position is effected as said mixer is furtherpivoted free of said tilting vessel.
 1. In combination: a stand, avessel, pivot means for rotatably supporting said vessel on said standbetween an operative mixing position and a tilted emptying position, amixer means mounted on said stand, said mixer means having a mixing headnormally disposed to extend into said vessel in the operative positionthereof, means for pivoting said mixer means on said stand to lift saidmixing head out from said vessel, and synchronizing means operativelyassociated with said mixer pivoting means to effect rotation of saidvessel after said mixing head is first pivoted a predetermined amountwhereupon pivoting of said vessel to tilted emptying position iseffected as said mixer is further pivoted free of said tilting vessel.2. The invention as defined in claim 1 wherein the pivot means of saidvessel and said mixer rotate about parallel axes.
 3. The invention asdefined in claim 1 wherein said stand includes a lower pedestal portionand an upper stand portion pivotally connected to the lower pedestalportion, said mixer means being mounted on said upper stand portion, andsaid vessel being rotatably journalled on said lower pedestal portion.4. The invention as defined in claim 1 and including positive lockingmeans for securing said vessel against rotation until said mixing headis first pivoted said predetermined amount.
 5. The invention as definedin claim 4 wherein said locking means includes a latch pivotally mountedon said stand adjacent said vessel pivot means normally operative tolock said pivot means from rotation, said latch being operativelyassociated with said synchronizing means to effect disengagement of saidlatch after said mixing head has been pivoted said predetermined amount.6. The invention as defined in claim 1 wherein said vessel pivotingmeans includes: a gear sector, and said synchronizing means includes anarm pivotally connected to said mixer pivoting means, said arm having arack adjacent the extended end thereof, said rack portion extending onlyalong a portion of said arm whereby said rack is disposed to mesh withsaid gear sector only after said mixer has pivoted said predeterminedamount.
 7. The invention as defined in claim 6 and including a positivelocking means operatively associated with said vessel pivoting means andsaid arm for securing said vessel against rotation until said rack isdisposed in meshing relationship with said gear sector.
 8. The inventionas defined in claim 7 wherein said locking means includes a latchinglever pivotally mounted on said stand adjacent said vessel pivot means,a catch formed on said vessel pivot means to normally receive saidlatch, spring means operating on said latch for normally biasing saidlatch toward unlatching position, aNd said arm normally operating onsaid latch to resist the bias of said spring means tending to urge saidlatching means toward locked position when said rack is out of meshingrelationship with said gear sector.
 9. The invention as defined in claim8 wherein said catch comprises a slot formed in said vessel pivotingmeans.
 10. In combination: a stand having a lowerportion and an upperportion, means for pivotally connecting said upper portion to said lowerportion, a vessel, pivot means for supporting said vessel on said lowerportion of said stand for rotation about an axis of rotation disposedparallel to the axis of rotation of said upper stand portion relative tosaid lower stand portion, a mixing means connected to the upper standportion to rotate therewith, said mixing means having a mixing headarranged to normally extend into said vessel, a gear sector operativelyassociated with the pivot means of said vessel, an arm pivotallyconnected to said upper stand portion, said arm having a rack sectorconnected to an end portion thereof whereby said rack sector engageswith said gear when said upper stand portion is pivoted relative to saidlower stand portion a predetermined amount so that upon further pivotingof said upper stand portion relative to said lower stand portion saidrack sector engages said gear to effect pivoting of said vessel aboutits axis of rotation, and a handle means for effecting the pivoting ofsaid upper stand portion.
 11. The invention as defined in claim 10 andincluding a positive locking means operatively associated between saidarm and said vessel pivoting means for securing said vessel fromrotating until said rack sector is disposed into meshing relationshipwith said gear sector.